Recall 15V690 affects 8 2014 Mack Granite (Gu) trucks for loose axle yoke hex nuts. Repair is free at any franchised Mack dealer.
Mack is recalling 8 2014 Granite (Gu) trucks because hex nuts on the drive-axle flange yoke were not tightened properly. If those nuts loosen, the driveshaft can disconnect from the drive axle, causing loss of propulsion and increasing crash risk; Mack dealers will complete the recall repair free of charge.
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What's wrong?
On the 2014 Mack Granite (Gu), the drive axle carries engine power through the driveline to move the truck. The flange yoke is the bolted connection point on that axle, and hex nuts hold that connection tight. Those nuts need the right clamp load so the driveline stays secure under heavy work and road vibration.
In this recall, the problem is improper tightening of the hex nuts on certain Marmon-Herrington drive axles. When the nuts are loose, the flange yoke does not stay clamped as designed. Normal vibration and driveline force can work against the connection, which leaves the axle assembly less secure than it should be.
The filing does not list an owner-noticeable symptom before the problem occurs. There is no warning sign before failure.
Who's affected?
| 2014 Mack Granite (Gu) | drive axle |
|---|---|
| Units affected | 8 |
| Field incidents | NHTSA has logged no field incidents to date. |
Not every 2014 Mack Granite (Gu) truck is on the list. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
Loose driveshaft hex nuts can let the driveshaft disconnect from the drive axle. That means the truck can lose propulsion in traffic, which increases the risk of a crash. Schedule the dealer inspection soon so the nut can be checked and tightened to the proper torque. Repair is free at any franchised Mack dealer.
What should I do?
- Check your VIN to confirm your 2014 Mack Granite (Gu) is included in this recall.
- Contact a franchised Mack dealer to schedule the free hex-nut inspection and torque service that secures the drive axle flange yoke.
- Bring the owner letter if you have it, and reference recall number 15V690 when you call.
- Use caution until the inspection is complete, and contact the dealer before another trip if the truck loses propulsion.
What happens at the repair
At the dealer, a Mack technician inspects the hex nut on the flange yoke for the affected drive axle. If the nut is not tightened to specification, the technician tightens it to the proper torque. The inspection and tightening are free under the recall. This is a dealer process for the axle hardware, so schedule the recall visit with a Mack dealer and reference Mack recall number SC0397 when you call.
Timeline
| October 22, 2015 | NHTSA published the recall |
|---|---|
| November 30, 2015 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| November 30, 2015 | Interim owner notification (was planned for this date) |
| December 9, 2015 | Owner notification mailed |
Frequently asked questions
What is recall 15V690?
Recall 15V690 covers 8 2014 Mack Granite (Gu) trucks with Marmon-Herrington drive axles whose flange-yoke hex nuts were not tightened to specification. A loose connection can let the driveshaft disconnect from the drive axle, causing loss of propulsion and increasing crash risk.
What should I do if my 2014 Mack Granite (Gu) is on this recall?
Check your VIN to confirm your specific truck is included in recall 15V690. If it is, contact a franchised Mack dealer and ask for recall SC0397. The dealer will inspect the hex nut and tighten it to the proper torque for free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Mack dealers will inspect and tighten the affected hex nut free of charge. Parts and labor are covered for included vehicles.
What is the safety risk?
The safety risk is loss of propulsion while driving. If the driveshaft disconnects from the drive axle, the truck loses power to the wheels, which increases crash risk. Use the VIN check first, then schedule the free Mack dealer repair if your truck is included.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/15V690000 |
|---|---|
| Mack customer service | 1-800-528-6586 |
| NHTSA recall # | 15V690 |
| NHTSA recall # (full) | 15V690000 |
Source documents
-
Download Owner Notification Letter (PDF) - Download Recall Report (PDF)
- Download Quarterly Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 31, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →